Allow modifying port for interactive login: `az login ... --port 1234`

**Related command**

```sh
az login
```

**Is your feature request related to a problem? Please describe.**

When you use VSCode remote development extension, it is not able to detect Azure CLI port and automatically forward it when `az login` is used with interactive login (even though it's able to intercept the xdg calls and open the browser tab to login). This means I have to manully copy the callback port and forward it every time I have to login which is a pain when you have many accounts.

**Describe the solution you'd like**

To solve this there could be a configuration option which would let us set a static port and we could then pre-forward it in the VSCode settings. GG EZ.

**Describe alternatives you've considered**

Well, I could open a feature request to VSCode to actually detect the dynamic port from the az cli commands, but I think this solution is much simpler and easier to implement.

**Additional context**

N/A